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Viral Replication: Lysogenic Cycle

Viral Replication: Lysogenic Cycle

The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects its...

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Updated: Jun 3, 2026

Visualizing the Interaction Between the Qdot-labeled Protein and Site-specifically Modified λ DNA at the Single Molecule Level

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Published on: July 17, 2018

Preparation and assay of phage lambda.

J W Dale¹, P J Greenaway

¹Department of Microbiology, University of Surrey, Guildford, Surrey.

Methods in Molecular Biology (Clifton, N.J.)

|March 5, 2011

Summary

This summary is machine-generated.

Bacteriophage lambda exhibits lytic and lysogenic replication cycles in E. coli. The cl gene repressor protein controls the balance, determining whether the phage DNA integrates into the host chromosome or replicates to lyse the cell.

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Area of Science:

Molecular Biology
Virology
Microbiology

Background:

Lambda phage is a temperate bacteriophage that infects E. coli.
It can undergo two replication cycles: lytic and lysogenic.

Purpose of the Study:

To elucidate the mechanisms governing the lytic and lysogenic replication cycles of bacteriophage lambda.
To understand the role of the cl gene product in maintaining lysogeny.

Main Methods:

The study describes the molecular events and regulatory mechanisms involved in both cycles.
Focuses on gene expression, DNA integration, and protein functions.

Main Results:

Lambda phage DNA can either replicate to produce new phages and lyse the host (lytic cycle) or integrate into the host chromosome (lysogenic cycle).
Lysogeny is maintained by the phage cl gene product, a repressor protein that suppresses most phage gene expression.
Inactivation of the repressor triggers the lytic cycle.

Conclusions:

The decision between lytic and lysogenic cycles is a complex regulatory process.
The concentration of the cl gene product is a critical factor in determining the phage's fate.